US20080260512A1 - Packaging System Including Pallet De-Layering System - Google Patents
Packaging System Including Pallet De-Layering System Download PDFInfo
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- US20080260512A1 US20080260512A1 US11/738,237 US73823707A US2008260512A1 US 20080260512 A1 US20080260512 A1 US 20080260512A1 US 73823707 A US73823707 A US 73823707A US 2008260512 A1 US2008260512 A1 US 2008260512A1
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- product
- void
- layer
- filling member
- void filling
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G61/00—Use of pick-up or transfer devices or of manipulators for stacking or de-stacking articles not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B35/00—Supplying, feeding, arranging or orientating articles to be packaged
- B65B35/30—Arranging and feeding articles in groups
- B65B35/44—Arranging and feeding articles in groups by endless belts or chains
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/52—Devices for transferring articles or materials between conveyors i.e. discharging or feeding devices
- B65G47/68—Devices for transferring articles or materials between conveyors i.e. discharging or feeding devices adapted to receive articles arriving in one layer from one conveyor lane and to transfer them in individual layers to more than one conveyor lane or to one broader conveyor lane, or vice versa, e.g. combining the flows of articles conveyed by more than one conveyor
- B65G47/71—Devices for transferring articles or materials between conveyors i.e. discharging or feeding devices adapted to receive articles arriving in one layer from one conveyor lane and to transfer them in individual layers to more than one conveyor lane or to one broader conveyor lane, or vice versa, e.g. combining the flows of articles conveyed by more than one conveyor the articles being discharged or distributed to several distinct separate conveyors or to a broader conveyor lane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G57/00—Stacking of articles
- B65G57/02—Stacking of articles by adding to the top of the stack
- B65G57/16—Stacking of articles of particular shape
- B65G57/20—Stacking of articles of particular shape three-dimensional, e.g. cubiform, cylindrical
- B65G57/22—Stacking of articles of particular shape three-dimensional, e.g. cubiform, cylindrical in layers each of predetermined arrangement
- B65G57/24—Stacking of articles of particular shape three-dimensional, e.g. cubiform, cylindrical in layers each of predetermined arrangement the layers being transferred as a whole, e.g. on pallets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/02—Articles
- B65G2201/0235—Containers
- B65G2201/0244—Bottles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S294/00—Handling: hand and hoist-line implements
- Y10S294/907—Sensor controlled device
Definitions
- the present application relates to packaging equipment and more particularly to a packaging system including a pallet de-layering system.
- Automated packaging machines are frequently used for packaging products for retail sale. Often times, the products are packaged by a producer or manufacturer of the product in cases. In some instances, the cases may be stacked onto a pallet forming a palletized unit so that many cases can be conveniently moved from one location to another during a single moving operation, for example, by a fork truck.
- the process by which the product is packaged by the producer may not be dictated by the retailer concerns. Considering beverages, for example, it may be simpler for the producer to package beverages having the same flavor together to form a single case or even to form a single pallet. By contrast, the retailer may desire a case and/or a pallet having an assortment of flavors, for example, corresponding more to consumer demand for the various flavors. It would be desirable to provide a process and apparatus for repackaging an assortment of already packaged product, for example, for delivery to a retail location.
- a pallet de-layering system in a packaging system for handling palletized product arranged in multiple layers of product cases, includes a gripper mechanism.
- the gripper mechanism is configured to clamp a layer of the multiple layers by applying a clamping force to one or more product cases of the layer such that the layer can be removed from an adjacent layer of product cases to a different location.
- the layer includes a void between adjacent product cases.
- the gripper mechanism includes a void filling member carried by the gripper mechanism. The void filling member is sized and located to be positioned within the void to limit movement of the adjacent product cases into the void during a clamping operation.
- a gripping head for use in carrying a plurality of product cases arranged in a substantially rectangular layer with at least one void space in the layer.
- the gripping head includes a frame having a central axis and a first pair of opposing side clamps mounted on the frame. At least one of the side clamps of the first pair is moveable between outward and inward positions relative to the central axis.
- a second pair of opposing side clamps are mounted on the frame. At least one of the side clams of the second pair being is moveable between outward and inward positions relative to the central axis, the second pair of opposing side clamps oriented transverse to the first pair of side clamps.
- a method of handling palletized product arranged in multiple product layers of product cases, where a product layer includes multiple cases arranged such that an interior void is located in the product layer includes locating a void filling member in the void of the product layer, the void filling member being carried by a gripper mechanism.
- the void filling member is expanded from a collapsed configuration to occupy a greater volume within the void thereby limiting movement of product cases into the void during a clamping operation.
- An inward clamping force is applied against a perimeter of the product layer using the gripper mechanism such that the product layer can be lifted and carried to a different location.
- FIG. 1 is a diagrammatic, side view of an embodiment of a palletized unit including multiple stacked layers
- FIG. 2 is a diagrammatic, top view of an embodiment of a layer of the palletized unit of FIG. 1 ;
- FIG. 3 is a diagrammatic, top view of another embodiment of a layer of the palletized unit of FIG. 1 ;
- FIG. 4 is a side view of an embodiment of a product case of the palletized unit of FIG. 1 ;
- FIG. 5 is an unscaled, diagrammatic, plan view of an embodiment of a packaging system
- FIG. 6 is a bottom view of an embodiment of a gripping mechanism for use in de-layering the palletized unit of FIG. 1 ;
- FIG. 7 is a side view of the gripping mechanism of FIG. 6 ;
- FIG. 8A is a side view of an embodiment of an expander in a retracted configuration for use with the gripping mechanism of FIG. 6 ;
- FIG. 8B is a side view of the expander of FIG. 8A in an expanded configuration for use with the gripper mechanism of FIG. 6 ;
- FIG. 9 is a side view of another embodiment of an expander for use with the gripper mechanism of FIG. 6 ;
- FIG. 10 is a top view of another embodiment of an expander for use with the gripper mechanism of FIG. 6 within a rectangular-shaped void;
- FIGS. 11 and 12 are diagrammatic, plan views of an embodiment of a film severing system
- FIG. 13 is a diagrammatic, bottom view of a product case
- FIGS. 14 and 15 are side views of a portion of the film severing system of FIG. 11 ;
- FIG. 16 illustrates an embodiment of a knife assembly for use in the film severing system of FIG. 11 ;
- FIG. 17 is a partial, end view of the knife assembly of FIG. 16 ;
- FIG. 18 is a detail view of the knife assembly of FIG. 16 ;
- FIGS. 19 and 20 are side views of an embodiment of a bottom film removal station
- FIG. 21 is a front view of an embodiment of a film lifting device
- FIGS. 22 and 23 are front and top views, respectively, of an embodiment of a product metering system
- FIGS. 24 and 25 are diagrammatic, exemplary plan views illustrating operation of the product metering system of FIG. 19 ;
- FIG. 26 is a diagrammatic, plan view of the metering system of FIG. 18 along with an embodiment of a product merging system.
- FIG. 27 is a diagrammatic, top view of a restocked product case having an assortment of products.
- a pallet de-layering system is described below as being used in a packaging system that can be used to disassemble pallets including an initial assortment of products (e.g., beverages), combine the products originating from different, disassembled pallets and then to re-assemble the pallets so that the re-assembled pallets include an assortment of products different from their initial assortment. It should be noted that the pallet de-layering system may be used with other product handling systems.
- products e.g., beverages
- a palletized unit 10 of products 12 includes multiple layers 14 a - 14 h of product cases stacked upon pallet 15 .
- the term “pallet” refers to a portable platform for handling, storing, and/or moving materials (as in warehouses, factories, or vehicles).
- the palletized unit 10 may be pre-assembled by, for example, a product manufacturer or distributor.
- the products 12 of the palletized unit 10 are all beverages having the same flavor and/or color.
- one layer may include products of one flavor and/or color and another layer may include products having a different flavor and/or color. Other flavor and/or color assortments are also possible.
- the pre-assembled palletized unit 10 includes beverages all having the same flavor and color.
- each layer 14 a - 14 h includes multiple product cases 16 a - 16 i in a particular arrangement where each product case includes multiple products 12 (e.g., 24 products per case).
- each layer 14 a - 14 h may be divided from an adjacent layer using a backing (not shown), such as a sheet of cardboard, plastic, wood, cloth, etc.
- the product cases 16 a - 16 i are arranged in a particular pattern with a long axis of some of the product cases being arranged in one direction and a long axis of others of the product cases being arranged in a substantially transverse direction (e.g., see product case 16 a and product case 16 b ).
- This arrangement of product cases 16 a - 16 i creates a pair of voids 20 and 22 between adjacent cases.
- the voids 20 and 22 are respectively defined by portions 24 a , 24 b , 24 d , 24 e and 26 e , 26 f , 26 h , 26 i of the product cases extending beyond an adjacent case.
- the voids 20 , 22 are about 55 ⁇ 8 inches or more in width.
- voids 28 and 30 of an adjacent layer 14 are located at different locations than (i.e., they are not aligned with) voids 20 and 22 . In FIG. 3 , voids 28 and 30 are located about 90 degrees from voids 20 and 22 of FIG. 2 .
- each product case 16 of each layer 14 a - 14 h is individually wrapped in a plastic film 32 (e.g., of shrink wrap material).
- a plastic film 32 e.g., of shrink wrap material
- FIG. 5 is a diagrammatic plan view of a packaging process and system for disassembling palletized units 10 so that products 12 of different palletized units can be combined in forming another palletized unit of assorted products.
- Packaging system 40 includes multiple lines 42 , 44 and 46 that receive and operate simultaneously on different palletized units 10 .
- each line may be dedicated to receive palletized units of a certain product type.
- line 42 may receive palletized units of beverages having a first flavor and/or color
- line 44 may receive palletized units of beverages having a second flavor and/or color
- line 46 may receive palletized units of beverages having a third flavor and/or color.
- two or more of the lines may receive palletized units of beverages having the same flavor and/or color
- one or more of the other lines may receive palletized units of beverages having a different flavor and/or color.
- Each line 42 , 44 and 46 includes a pallet infeed 48 where palletized units 10 of product 12 are introduced to the packaging system.
- An automated stretch film removal device 50 removes the stretch film 17 from the palletized unit 10 .
- the removed stretch film 17 is delivered along a recycle path (not shown) to a shredder and bailer system.
- the layers 14 may be separated from each other at a layer removal station 52 including a pallet de-layering system 54 .
- the pallet de-layering system 54 removes each layer 14 of product cases 16 one-by-one, e.g., with the palletized unit 10 at rest and places the product cases on a singulating conveyor 56 .
- the pallet is located on a pallet recycle path 57 , which carries the pallets (e.g., by conveyor) to the input side of a palletizer 112 .
- each layer 14 includes multiple product cases 16 .
- the singulating conveyor 56 is used to orient the product cases 16 in a desired alignment.
- the product cases 16 are oriented by the singulating conveyor 56 such that their long axes are aligned with the direction of travel in single file. Other configurations are possible, however.
- a film removal station 58 is used to remove the plastic film 32 from the individual product cases 16 in an in-line process.
- the film removal station 58 cuts the plastic film 32 , removes the plastic film from the product cases 16 and sends the plastic film to the shredder and bailer system.
- a detection system 59 e.g., a vision system
- the detection system 59 may be used to detect film removal errors and/or product displacement. If a film removal error and/or product displacement is detected, the affected product case 16 may be diverted to a reject path 61 .
- the product cases 16 are directed to a product removal station 60 .
- Robots 62 at the product removal station 60 are used to lift products 12 from their trays 64 ( FIG. 3 ) and place the product on the product conveyor 66 .
- Empty trays 64 are placed on a recycle path 68 that leads to a tray accumulation station 70 , where empty trays wait to be delivered to a repacking station 86 , 88 .
- empty trays 64 may bypass the accumulation station 70 and be sent directly to the repacking station 86 and 88 as indicated by bypass path 89 of FIG. 5 .
- the individual products 12 are delivered by the product conveyors 66 to a metering system 74 .
- the three product lines 42 , 44 and 46 Prior to reaching the metering system 74 , however, the three product lines 42 , 44 and 46 are merged into two product lines 82 and 84 at merging station 85 .
- an assortment of products associated with each product line 82 and 84 can be achieved.
- each product line 42 , 44 and 46 feeds product into each product line 82 and 84 .
- the two product lines 82 , 84 are associated with two repacking stations 86 and 88 where trays 64 are repacked with an assortment of products 12 that is different than their initial assortment.
- the metering system 74 is used to meter out products based on a desired case product assortment.
- the desired case product assortment is determined by the retailer based, for example, on consumer demand for each product type.
- the metering system 74 is used to control the amount of each product flavor and/or color repacked into the trays 64 .
- the metered out product 12 is fed to outfeed 90 .
- the amount of product 12 fed to the outfeed 90 corresponds to the number of products carried by the trays 64 and the number of trays to be repacked at a time and the assortment of the products is predetermined as indicated above.
- Robots 92 and 94 are used to transfer the assortment of products 12 from the outfeed 90 to the trays 64 , which are delivered from the tray accumulation station 70 or product removal station 60 .
- the repacked trays 64 have a product assortment that is different from their original product assortment.
- the robot 92 , 94 repackages more than one tray 64 at a time, such as four trays at a time at the repacking stations 86 and 88 .
- the repacked product cases are delivered to a shrink wrap system 93 , 95 where the repacked product cases are rewrapped with shrink wrap film (e.g., e.g., at a rate of between about 35 and about 70 cases per minute) and delivered through a shrink film shrinking station 98 (e.g., that heats the shrink film for a shrinking operation).
- a detection system 100 is provided that detects whether the trays 64 are correctly repackaged, for example, looking at number of products (or filled product spaces), product color, etc. If a repacked product case is not correctly repacked, that case may be diverted onto reject path 102 , before it reaches the shrink wrap station.
- the repacked product cases are then delivered from the shrinking station 98 to a merging station 104 that merges conveyor lanes 106 and 108 into a single lane 110 .
- the repacked product cases are then palletized at the palletizer 112 by arranging and stacking the repacked product cases onto the pallets 15 transported from the de-layering system 54 .
- the palletizer 112 stacks the repacked product cases onto the pallets 15 in substantially the same arrangement as described above with reference to FIGS. 1-3 to form a palletized unit of assorted products.
- the palletizer 112 may stack the repacked product cases in some other arrangement, for example, dictated by the retailer.
- the palletized units are then stretch wrapped at a stretch wrap station 114 and transported from the packaging system 40 .
- the pallet de-layering system 54 removes each layer 14 of product cases 16 one-by-one and places the product cases on the singulating conveyor 56 .
- the pallet de-layering system 54 includes a robot arm 116 (e.g., capable of both lateral, vertical and rotational movement) with a gripper mechanism 118 that can be moved by the robot arm 116 over to the palletized unit 10 to grip each layer 14 in consecutive gripping operations.
- a suitable robot arm is a M-410 Intelligent Palletizing Robot, commercially available from Fanuc, Ltd.
- the gripper mechanism 118 is somewhat square in shape (e.g., corresponding to the shape of each layer 14 ) and includes a frame 120 and opposing grippers 122 , 124 and 126 , 128 .
- the opposing grippers 122 , 124 and 126 , 128 have a gripping surface that extends substantially parallel to respective edges of the layer 14 and are moveable (e.g., pneumatically, motor driven, etc.) inwardly toward each other in order to apply a gripping force (e.g., of between about 1508 lbs and about 2010 lbs) to product cases 16 of a layer 14 of the palletized unit 10 .
- a gripping force e.g., of between about 1508 lbs and about 2010 lbs
- only some of the grippers may be moveable (e.g., such as grippers 122 and 128 or grippers 128 and 124 or grippers 124 and 126 or grippers 126 and 122 ) and the other grippers stationary.
- layers 14 of product cases 16 include a pair of voids (e.g., voids 20 , 22 ) located between adjacent product cases. These voids 20 , 22 tend to allow the product cases 16 to move inwardly when a gripping force is applied to the periphery of the layer 14 , which may increase the probability of an ineffective gripping operation.
- voids 20 , 22 tend to allow the product cases 16 to move inwardly when a gripping force is applied to the periphery of the layer 14 , which may increase the probability of an ineffective gripping operation.
- the gripper mechanism 118 includes expanders 130 a - 130 d shown in FIGS. 6 and 7 .
- the expanders 130 are vertically moveable up-and-down relative to the frame 120 so that they may be placed into voids, when applicable.
- the expanders 130 a - 130 d also have a collapsed configuration ( FIG. 8A ) and an expanded configuration (shown by FIGS. 7 and 8A ).
- the collapsed configuration is used when extending the expanders 130 and inserting the expanders into the voids and the expanded configuration is used to occupy a greater volume within the voids relative to the collapsed configuration to inhibit movement of the adjacent product cases 16 into the voids.
- a controller 132 is used to control operation of the gripper mechanism 118 including grippers 122 , 124 , 126 and 128 and expanders 130 .
- the pairs of grippers 122 , 124 and 126 , 128 may be mechanically linked so that they move together (e.g., in opposing pairs) or they may each move independently.
- the expanders 130 in the illustrated embodiment, are driven using pneumatics 134 .
- the controller 132 controls actuation of the pneumatics 134 using a void detection system 136 .
- the void detection system 136 includes sensors 138 that can be used to detect the presence of a void and to send a corresponding indication to the controller 132 .
- magnetic sensors 138 are associated with the pneumatic cylinders to detect movement of the cylinder rods out of their extended positions.
- the controller 132 upon receipt of the indication, raises and/or lowers the corresponding expanders 130 relative to the frame 120 as needed to fill the identified voids. Once the extended expanders 130 are in the voids, the controller 132 then expands the expanders to their expanded configurations.
- layer 14 of FIG. 2 has voids 20 and 22 at the illustrated positions.
- the gripper mechanism 118 includes layer edge detecting sensors 139 , each sensor used by the controller 132 to detect an edge 141 a and 141 b of the layer 14 , which can be used by the controller to center the gripper mechanism above the layer.
- the edge detecting sensors 139 may be used for each layer, only some layers or even only the top layer.
- the expanders 130 a - 130 d are initially in their lowered positions and the gripper mechanism 118 is lowered onto the layer 14 . As the gripper mechanism 118 is lowered, expanders 130 a and 130 d contact product cases 16 , which forces the expanders 130 a and 130 d to move upward.
- the magnetic sensors 138 are used to detect this movement, which indicates that expanders 30 a and 30 d are not aligned with voids 20 and 22 .
- the lack of any signal change from the sensors 138 associated with the expanders 130 b and 130 c indicates that these expanders are aligned with respective voids 10 , 22 .
- the controller 132 then controls the pneumatics to raise the expanders 130 a and 130 d . Expanders 130 b and 130 c are lowered into the voids 20 and 22 as the gripper mechanism 118 is lowered into its gripping position.
- the controller 132 upon receipt of the indication from the detectors 138 , retracts expanders 130 b and 130 c as expanders 130 a and 130 d are lowered into the voids 28 and 30 .
- the expanders 130 may be lowered relative to the frame 120 before, while or after the gripper mechanism 118 is lowered onto the respective layer 14 for the gripping operation.
- the appropriate expanders 130 are in the voids 20 , 22 , 28 , 30 , they are expanded using an actuator 140 (e.g., an air cylinder), which is connected to linkages 142 shown most clearly by FIGS. 8A and 8B .
- the linkages 142 cause pivot arms 144 to pivot outwardly as the actuator 140 extends to its position illustrated by FIG. 8B by riding along angled surfaces 143 of the linkages.
- the expander 130 locks in its expanded position during layer gripping. Locking the expander 130 in its expanded position inhibits the collapse of the expander during a gripping operation, even if pneumatic pressure is lost, which can decrease the probability of a failed gripping operation.
- the product cases 16 responsively move and apply pressure against the expander pivot arms 144 .
- This causes the pivot linkages 142 to press against the lowered portion of the actuator 140 , thereby holding the actuator against upward movement until the side grippers 122 , 124 , 126 and 128 are moved to release the layer 14 .
- springs (not shown) are used to spring bias the pivot arms 144 toward their collapsed configurations.
- the locations, sizes and/or shapes of the voids may change, for example, depending on product and/or product case characteristics, such as size/shape of the product container, number of products per product case, etc.
- the gripper mechanism 118 may be desirable to provide with interchangeable expanders and/or provide the gripper mechanism with the capability to change the positions of the expanders relative to the frame 120 .
- the expander 130 includes a quick disconnect pin 145 that can be used to disconnect the expander 130 from the lower end of the pneumatic cylinder rod, which remains with the gripper mechanism 118 . Removal of the pin and disconnecting of the air lines that operate the cylinder 140 allows the expander 130 to be readily removed.
- the gripper mechanism may then be connected to the gripper mechanism that includes an offset design where the expander 147 has an actuation axis E that is offset from an actuation axis A.
- the offset actuation axis configuration is used to account for differences in void location as between pallet layers for different products.
- Various other expander configurations are possible. For example, referring to FIG. 10 , a rectangular expander 149 is shown within a rectangular void 151 .
- the gripper mechanism 118 may also be used to move the pallet 15 onto the pallet recycle path 57 ( FIG. 5 ) after all the layers 14 are removed there from.
- the controller 132 may not lower any of the expanders 130 as the detectors 138 may not detect any voids. Similar to moving the layers 14 , the gripper mechanism 118 may grip the pallet 15 using gripper pairs 122 , 124 and 126 , 128 to apply a gripping force to the pallet.
- the film removal station 58 ( FIG. 5 ) is used to remove the plastic film 32 ( FIG. 4 ) from the individual product cases 16 in an in-line process.
- FIG. 11 a film cutting process for use in removing the plastic film 32 is illustrated diagrammatically.
- the film removal station 58 includes a first knife pair 146 and a second knife pair 148 .
- the first knife pair 146 is illustrated as being initially outside of and oriented substantially perpendicular to the conveyor path 150
- the second knife pair 148 is located at opposite edges of and oriented substantially parallel to conveyor path 150 , downstream of the first knife pair.
- element 159 is a conveyor segment that allows the first knife pair 146 to pass thereby.
- element 159 may be one or more spaced rollers that are arranged and configured to allow the first knife pair 146 to pass thereby.
- the knife pairs 146 , 148 cut the bottom of the plastic film entirely across the length and width of the bottom.
- the first knife pair 146 cuts at a bottom leading edge (e.g., at most about 1 inch or less from the leading edge, such as about 1 ⁇ 2 inch) and at bottom trailing edge (e.g., at most about 1 inch or less from the trailing edge, such as about 1 ⁇ 2 inch) of the product case 16
- the second knife pair 148 cut at bottom machine direction edges (e.g., at most about 1 inch or less from the trailing edge, such as about 1 ⁇ 2 inch) of the product case.
- FIGS. 14 and 15 show a heated knife assembly 161 of the second knife pair 148 in greater detail.
- the heated knife assembly 161 includes a mount 160 and parallel arms 162 and 163 pivotally connected to the mount.
- a heated knife 164 is mounted to the arms 162 .
- the heated knife 164 is pivotally mounted to the arms 162 and 163 so that the knife can pivot in the direction of arrows 166 and 168 to accommodate tray bottom irregularities and to assure the knife cut is made all the way to the edge of the product case 16 .
- the heated knife 164 is biased upwardly by biasing mechanism 170 that is connected to the arms 162 .
- Biasing mechanism 170 includes an air cylinder 172 that acts as an adjustable spring supplying a vertical biasing force that can be used to hold the heated knife 164 against the bottom of the product case 16 (see FIG. 15 ).
- the first knife pair 146 can include similar pivoting and biasing structure.
- the heated knife 164 has a double truncated pyramid shape with two peaks 174 and 176 separated by a valley 178 .
- the cutting edge (see element 176 ) of the heated knife 164 is thin and sharpened to a point to provide for film burn off, which can improve cutting during use. Peaks 174 and 176 include the cutting surfaces.
- a cartridge heater 190 is used to heat the knife 164 .
- An insulating base 180 supports the heated knife 164 .
- a pair of wave springs 182 and 186 located on opposite sides of pivot joint 188 provide opposing biasing forces that are used to bias the heated knife in the illustrated horizontal position.
- the cutting edge 175 of the knife 164 is heated to a temperature such that during the cutting operation, the plastic film 32 melts away from the knife, which along with the sharpened edge 175 can improve film burn off and inhibit accumulation of plastic on the cutting edge.
- the knife 164 is heated to a temperature between about 800 and 900 degrees F.
- the two peak construction of the knife cutting edge 175 in combination with the pivoting action, enables a single pass of a knife against the bottom of a case to perform two cuts along the same line, but separated slightly in time. These two cuts separated in time can be advantageous for cutting thicker or multilayer plastic film.
- a bottom film removal station 190 is used to remove a portion 192 ( FIG. 14 ) of the plastic film 32 from the product case 16 after it has been cut.
- Bottom film removal station 190 includes a bottom vacuum conveyor 193 that moves in the direction of arrow 194 and a counter rotating nip roller 196 .
- a film vacuum removal nozzle 198 is located below the counter rotating nip roller 196 .
- the film portion 192 is pulled between the counter rotating nip roller and the bottom vacuum conveyor 192 as the product case 16 moves thereover. The removed film portion 192 is then drawn into the film vacuum removal nozzle 198 using negative pressure.
- a second film vacuum removal nozzle 200 is then used to draw a remaining portion 202 of the plastic film 32 from the product case 16 , thereby removing the plastic film.
- the full cross-cuts 152 , 154 , 156 , 158 facilitate removal of the portions 192 and 202 of the plastic film 32 .
- a film lifting device 203 is used to lift the remaining portion 202 of the plastic film 32 from the product case 16 prior to reaching the vacuum removal nozzle 200 .
- counter-rotating mechanisms 204 are placed on opposite sides of the case conveying path and include includes rotating fingers 205 (e.g., having rubber ends 207 ) that come into contact with the remaining portion 202 of the plastic film 32 and apply a lifting force to the plastic film at the machine direction sides of the product case. The lifting force loosens the remaining portion 202 of the plastic film 32 , which is then removed using the vacuum nozzle 200 .
- the product cases 16 are directed to the product removal station 60 where the robots 62 lift products 12 from their trays 64 and place the product on the product conveyor 66 ( FIG. 5 ).
- the individual products 12 are delivered to the metering system 74 .
- FIGS. 22 and 23 illustrate the metering system 74 associated with one of the product lines 82 or 84 .
- the metering system 74 is used to control the amount of a certain product flavor and/or color delivered to the repacking stations 86 or 88 .
- Pins 208 are used as removable barriers to control feeding of products 12 from certain product columns, which columns are separated by rails which are not shown.
- the pins 208 are connected to rails 210 and 212 , which are operatively connected to a reversible motor 214 (e.g., using a rack and pinion drive) so that the motor can slide the rails 210 and 212 back and forth to move the pins into and out of the associated product path.
- the end product columns 216 , 218 , 236 , 238 and middle product column 244 do not have any associated pins 208 so that products travel through these columns unimpeded.
- FIG. 24 shows a diagrammatic, simplified metering system 74 to illustrate its operation in metering products.
- the illustrated metering system 74 includes a first product path 220 and a second product path 222 .
- Products Y of a first flavor and/or color (e.g., yellow) travel along path 220 and products B of a second flavor and/or color (e.g., blue) travel along path 222 .
- Pins 208 B are connected to rail B (represented by dotted lines) and pins 208 F are connected to rail F (represented by dotted lines).
- pins 208 F are positioned out of the associated product path to allow products to pass thereby and pins 208 B are positioned in the associated product path to prevent products from passing thereby.
- the first product path 220 is in a feed cycle where three product Y is fed from the metering system 74 while the second product path 222 is in a reload cycle where no product B is fed from the metering system. During the reload cycle, the products B are advanced along second product path 222 up to the pin 208 B.
- pins 208 B are positioned out of the associated product path to allow products to pass thereby and pins 208 F are positioned in the associated product path to prevent products from passing thereby.
- the second product path 222 is in a feed cycle where one product B is fed from the metering system while the first product path 220 is in a reload cycle where no product Y is fed from the metering system. During the reload cycle, the products Y are advanced along the first product path 220 up to the pin 208 F.
- the upstream pins are located a distance from the downstream pins to allow the desired amount of product (e.g., 1 blue and 3 yellow) to fit therebetween.
- linkages 225 shown most clearly by FIG. 23 allow for placement of the pins 208 at spaced-apart distances.
- the pins 208 are moveable along the length of the linkages to change the distances between the upstream pins and the downstream pins and thus the amount of product that can fit therebetween.
- the above-described metering process is repeated and products 12 are fed from the metering system 74 to a merging station 232 where products from some adjacent rows leaving the metering system are merged together to create rows of products having different flavors and/or colors.
- the metering system 74 includes nine product columns 216 , 218 , 240 , 242 , 244 , 246 , 248 , 236 and 238 .
- Each column 216 , 218 , 240 , 242 , 244 , 246 , 248 , 236 and 238 has products 12 of a particular color and/or flavor associated therewith represented by R (e.g., red), Y (e.g., yellow) and B (e.g., blue).
- End columns 216 , 218 , 236 , 238 and middle column 244 feed directly into respective paths 250 , 252 , 254 , 256 and 258 of the merging station 232 without any merging of products 12 .
- columns 240 and 242 merge into path 260 to provide a column of both R and Y products as the products are metered using pins 208 F and 208 B from the metering system 74 and columns 246 and 248 merge into path 262 to provide a column of both Y and B products as the products are metered using pins 208 F and 208 B from the metering system.
- the metering system 74 meters the products so that, once merged in paths 260 and 262 , repeating patterns of products are created. In one embodiment, for example, it may be desirable to create repeating patterns of three Y products and one red product along path 260 and three Y products and one B product along path 262 .
- Each path 250 , 252 , 254 , 256 , 258 , 260 and 262 feeds product into the repacking stations 86 and 88 ( FIG. 5 ) where the products are accumulated. Once products are accumulated, they are transferred back into trays 64 .
- FIG. 27 illustrates repacked trays of an assortment of products 12 including a predetermined number of B, Y and R products 12 .
- each row 264 , 266 , 268 , 270 of repacked products includes individual product delivered along each path 250 , 252 , 254 , 256 , 258 , 260 and 262 .
- the reconstituted product cases are shrink wrapped, stacked into layers onto a pallet and then stretch wrapped as described above.
Abstract
Description
- The present application relates to packaging equipment and more particularly to a packaging system including a pallet de-layering system.
- Automated packaging machines are frequently used for packaging products for retail sale. Often times, the products are packaged by a producer or manufacturer of the product in cases. In some instances, the cases may be stacked onto a pallet forming a palletized unit so that many cases can be conveniently moved from one location to another during a single moving operation, for example, by a fork truck.
- The process by which the product is packaged by the producer may not be dictated by the retailer concerns. Considering beverages, for example, it may be simpler for the producer to package beverages having the same flavor together to form a single case or even to form a single pallet. By contrast, the retailer may desire a case and/or a pallet having an assortment of flavors, for example, corresponding more to consumer demand for the various flavors. It would be desirable to provide a process and apparatus for repackaging an assortment of already packaged product, for example, for delivery to a retail location.
- In an aspect, in a packaging system for handling palletized product arranged in multiple layers of product cases, a pallet de-layering system includes a gripper mechanism. The gripper mechanism is configured to clamp a layer of the multiple layers by applying a clamping force to one or more product cases of the layer such that the layer can be removed from an adjacent layer of product cases to a different location. The layer includes a void between adjacent product cases. The gripper mechanism includes a void filling member carried by the gripper mechanism. The void filling member is sized and located to be positioned within the void to limit movement of the adjacent product cases into the void during a clamping operation.
- In another aspect, a gripping head for use in carrying a plurality of product cases arranged in a substantially rectangular layer with at least one void space in the layer is provided. The gripping head includes a frame having a central axis and a first pair of opposing side clamps mounted on the frame. At least one of the side clamps of the first pair is moveable between outward and inward positions relative to the central axis. A second pair of opposing side clamps are mounted on the frame. At least one of the side clams of the second pair being is moveable between outward and inward positions relative to the central axis, the second pair of opposing side clamps oriented transverse to the first pair of side clamps.
- In another aspect, a method of handling palletized product arranged in multiple product layers of product cases, where a product layer includes multiple cases arranged such that an interior void is located in the product layer is provided. The method includes locating a void filling member in the void of the product layer, the void filling member being carried by a gripper mechanism. The void filling member is expanded from a collapsed configuration to occupy a greater volume within the void thereby limiting movement of product cases into the void during a clamping operation. An inward clamping force is applied against a perimeter of the product layer using the gripper mechanism such that the product layer can be lifted and carried to a different location.
- The details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims.
-
FIG. 1 is a diagrammatic, side view of an embodiment of a palletized unit including multiple stacked layers; -
FIG. 2 is a diagrammatic, top view of an embodiment of a layer of the palletized unit ofFIG. 1 ; -
FIG. 3 is a diagrammatic, top view of another embodiment of a layer of the palletized unit ofFIG. 1 ; -
FIG. 4 is a side view of an embodiment of a product case of the palletized unit ofFIG. 1 ; -
FIG. 5 is an unscaled, diagrammatic, plan view of an embodiment of a packaging system; -
FIG. 6 is a bottom view of an embodiment of a gripping mechanism for use in de-layering the palletized unit ofFIG. 1 ; -
FIG. 7 is a side view of the gripping mechanism ofFIG. 6 ; -
FIG. 8A is a side view of an embodiment of an expander in a retracted configuration for use with the gripping mechanism ofFIG. 6 ; -
FIG. 8B is a side view of the expander ofFIG. 8A in an expanded configuration for use with the gripper mechanism ofFIG. 6 ; -
FIG. 9 is a side view of another embodiment of an expander for use with the gripper mechanism ofFIG. 6 ; -
FIG. 10 is a top view of another embodiment of an expander for use with the gripper mechanism ofFIG. 6 within a rectangular-shaped void; -
FIGS. 11 and 12 are diagrammatic, plan views of an embodiment of a film severing system; -
FIG. 13 is a diagrammatic, bottom view of a product case; -
FIGS. 14 and 15 are side views of a portion of the film severing system ofFIG. 11 ; -
FIG. 16 illustrates an embodiment of a knife assembly for use in the film severing system ofFIG. 11 ; -
FIG. 17 is a partial, end view of the knife assembly ofFIG. 16 ; -
FIG. 18 is a detail view of the knife assembly ofFIG. 16 ; -
FIGS. 19 and 20 are side views of an embodiment of a bottom film removal station; -
FIG. 21 is a front view of an embodiment of a film lifting device; -
FIGS. 22 and 23 are front and top views, respectively, of an embodiment of a product metering system; -
FIGS. 24 and 25 are diagrammatic, exemplary plan views illustrating operation of the product metering system ofFIG. 19 ; -
FIG. 26 is a diagrammatic, plan view of the metering system ofFIG. 18 along with an embodiment of a product merging system; and -
FIG. 27 is a diagrammatic, top view of a restocked product case having an assortment of products. - A pallet de-layering system is described below as being used in a packaging system that can be used to disassemble pallets including an initial assortment of products (e.g., beverages), combine the products originating from different, disassembled pallets and then to re-assemble the pallets so that the re-assembled pallets include an assortment of products different from their initial assortment. It should be noted that the pallet de-layering system may be used with other product handling systems.
- Referring to
FIG. 1 , a palletizedunit 10 of products 12 (e.g., beverages, such as a sports drink) includesmultiple layers 14 a-14 h of product cases stacked uponpallet 15. As used herein, the term “pallet” refers to a portable platform for handling, storing, and/or moving materials (as in warehouses, factories, or vehicles). The palletizedunit 10 may be pre-assembled by, for example, a product manufacturer or distributor. In one embodiment, theproducts 12 of the palletizedunit 10 are all beverages having the same flavor and/or color. In other embodiments, one layer may include products of one flavor and/or color and another layer may include products having a different flavor and/or color. Other flavor and/or color assortments are also possible. For purposes of this description, however, the pre-assembled palletizedunit 10 includes beverages all having the same flavor and color. - The
layers 14 a-14 h are illustrated as being wrapped together in a plastic film 17 (e.g., by stretch wrapping). Referring also toFIG. 2 , eachlayer 14 a-14 h includesmultiple product cases 16 a-16 i in a particular arrangement where each product case includes multiple products 12 (e.g., 24 products per case). In some embodiments, eachlayer 14 a-14 h may be divided from an adjacent layer using a backing (not shown), such as a sheet of cardboard, plastic, wood, cloth, etc. Theproduct cases 16 a-16 i are arranged in a particular pattern with a long axis of some of the product cases being arranged in one direction and a long axis of others of the product cases being arranged in a substantially transverse direction (e.g., seeproduct case 16 a andproduct case 16 b). This arrangement ofproduct cases 16 a-16 i creates a pair ofvoids voids portions voids FIG. 3 , in some embodiments, voids 28 and 30 of anadjacent layer 14 are located at different locations than (i.e., they are not aligned with) voids 20 and 22. InFIG. 3 , voids 28 and 30 are located about 90 degrees fromvoids FIG. 2 . - Referring also to
FIG. 4 , eachproduct case 16 of eachlayer 14 a-14 h is individually wrapped in a plastic film 32 (e.g., of shrink wrap material). -
FIG. 5 is a diagrammatic plan view of a packaging process and system for disassemblingpalletized units 10 so thatproducts 12 of different palletized units can be combined in forming another palletized unit of assorted products.Packaging system 40 includesmultiple lines palletized units 10. In some instances, each line may be dedicated to receive palletized units of a certain product type. For example,line 42 may receive palletized units of beverages having a first flavor and/or color,line 44 may receive palletized units of beverages having a second flavor and/or color andline 46 may receive palletized units of beverages having a third flavor and/or color. In other embodiments, two or more of the lines may receive palletized units of beverages having the same flavor and/or color, while one or more of the other lines may receive palletized units of beverages having a different flavor and/or color. - Each
line pallet infeed 48 where palletizedunits 10 ofproduct 12 are introduced to the packaging system. An automated stretchfilm removal device 50 removes thestretch film 17 from the palletizedunit 10. In some embodiments, the removedstretch film 17 is delivered along a recycle path (not shown) to a shredder and bailer system. - Once the
stretch film 17 is removed, thelayers 14 may be separated from each other at alayer removal station 52 including apallet de-layering system 54. Thepallet de-layering system 54 removes eachlayer 14 ofproduct cases 16 one-by-one, e.g., with the palletizedunit 10 at rest and places the product cases on asingulating conveyor 56. Once all thelayers 14 are removed, the pallet is located on apallet recycle path 57, which carries the pallets (e.g., by conveyor) to the input side of apalletizer 112. - As indicated above, each
layer 14 includesmultiple product cases 16. Thesingulating conveyor 56 is used to orient theproduct cases 16 in a desired alignment. In some instances, theproduct cases 16 are oriented by thesingulating conveyor 56 such that their long axes are aligned with the direction of travel in single file. Other configurations are possible, however. - A
film removal station 58 is used to remove theplastic film 32 from theindividual product cases 16 in an in-line process. Thefilm removal station 58 cuts theplastic film 32, removes the plastic film from theproduct cases 16 and sends the plastic film to the shredder and bailer system. In some embodiments, a detection system 59 (e.g., a vision system) is included. Thedetection system 59 may be used to detect film removal errors and/or product displacement. If a film removal error and/or product displacement is detected, the affectedproduct case 16 may be diverted to areject path 61. - Once the
plastic film 32 is removed, theproduct cases 16 are directed to aproduct removal station 60.Robots 62 at theproduct removal station 60 are used to liftproducts 12 from their trays 64 (FIG. 3 ) and place the product on theproduct conveyor 66. Empty trays 64 are placed on arecycle path 68 that leads to atray accumulation station 70, where empty trays wait to be delivered to a repackingstation accumulation station 70 and be sent directly to the repackingstation bypass path 89 ofFIG. 5 . - The
individual products 12 are delivered by theproduct conveyors 66 to ametering system 74. Prior to reaching themetering system 74, however, the threeproduct lines product lines station 85. As can be appreciated, by merging the threeproduct lines product lines product line product line product line product lines stations products 12 that is different than their initial assortment. - The
metering system 74 is used to meter out products based on a desired case product assortment. In some embodiments, the desired case product assortment is determined by the retailer based, for example, on consumer demand for each product type. As will be described in greater detail below, themetering system 74 is used to control the amount of each product flavor and/or color repacked into the trays 64. - The metered out
product 12 is fed to outfeed 90. The amount ofproduct 12 fed to the outfeed 90 corresponds to the number of products carried by the trays 64 and the number of trays to be repacked at a time and the assortment of the products is predetermined as indicated above. -
Robots products 12 from the outfeed 90 to the trays 64, which are delivered from thetray accumulation station 70 orproduct removal station 60. The repacked trays 64 have a product assortment that is different from their original product assortment. In some embodiments, therobot stations products 12 forming repacked product cases (e.g., at a rate of about 35 repacked product cases per minute), the repacked product cases are delivered to ashrink wrap system detection system 100 is provided that detects whether the trays 64 are correctly repackaged, for example, looking at number of products (or filled product spaces), product color, etc. If a repacked product case is not correctly repacked, that case may be diverted ontoreject path 102, before it reaches the shrink wrap station. - The repacked product cases are then delivered from the shrinking
station 98 to a mergingstation 104 that mergesconveyor lanes single lane 110. The repacked product cases are then palletized at thepalletizer 112 by arranging and stacking the repacked product cases onto thepallets 15 transported from thede-layering system 54. In some embodiments, thepalletizer 112 stacks the repacked product cases onto thepallets 15 in substantially the same arrangement as described above with reference toFIGS. 1-3 to form a palletized unit of assorted products. Alternatively, thepalletizer 112 may stack the repacked product cases in some other arrangement, for example, dictated by the retailer. The palletized units are then stretch wrapped at astretch wrap station 114 and transported from thepackaging system 40. - The Pallet De-Layering System
- As indicated above, the
pallet de-layering system 54 removes eachlayer 14 ofproduct cases 16 one-by-one and places the product cases on thesingulating conveyor 56. Thepallet de-layering system 54 includes a robot arm 116 (e.g., capable of both lateral, vertical and rotational movement) with agripper mechanism 118 that can be moved by therobot arm 116 over to the palletizedunit 10 to grip eachlayer 14 in consecutive gripping operations. A suitable robot arm is a M-410 Intelligent Palletizing Robot, commercially available from Fanuc, Ltd. - Referring to
FIG. 6 , thegripper mechanism 118 is somewhat square in shape (e.g., corresponding to the shape of each layer 14) and includes aframe 120 and opposinggrippers grippers layer 14 and are moveable (e.g., pneumatically, motor driven, etc.) inwardly toward each other in order to apply a gripping force (e.g., of between about 1508 lbs and about 2010 lbs) toproduct cases 16 of alayer 14 of the palletizedunit 10. In an alternative embodiment, only some of the grippers may be moveable (e.g., such asgrippers grippers grippers grippers 126 and 122) and the other grippers stationary. - Referring briefly back to
FIG. 2 , layers 14 ofproduct cases 16 include a pair of voids (e.g., voids 20, 22) located between adjacent product cases. Thesevoids product cases 16 to move inwardly when a gripping force is applied to the periphery of thelayer 14, which may increase the probability of an ineffective gripping operation. - To obviate the possible effect of the voids on the gripping operation, the
gripper mechanism 118 includesexpanders 130 a-130 d shown inFIGS. 6 and 7 . As represented byarrows expanders 130 are vertically moveable up-and-down relative to theframe 120 so that they may be placed into voids, when applicable. Theexpanders 130 a-130 d also have a collapsed configuration (FIG. 8A ) and an expanded configuration (shown byFIGS. 7 and 8A ). The collapsed configuration is used when extending theexpanders 130 and inserting the expanders into the voids and the expanded configuration is used to occupy a greater volume within the voids relative to the collapsed configuration to inhibit movement of theadjacent product cases 16 into the voids. - In some embodiments, a
controller 132 is used to control operation of thegripper mechanism 118 includinggrippers expanders 130. The pairs ofgrippers expanders 130, in the illustrated embodiment, are driven usingpneumatics 134. Thecontroller 132 controls actuation of thepneumatics 134 using avoid detection system 136. Thevoid detection system 136 includessensors 138 that can be used to detect the presence of a void and to send a corresponding indication to thecontroller 132. In one embodiment,magnetic sensors 138 are associated with the pneumatic cylinders to detect movement of the cylinder rods out of their extended positions. However, other void detection sensing systems could be used. Thecontroller 132, upon receipt of the indication, raises and/or lowers the correspondingexpanders 130 relative to theframe 120 as needed to fill the identified voids. Once theextended expanders 130 are in the voids, thecontroller 132 then expands the expanders to their expanded configurations. - For example,
layer 14 ofFIG. 2 hasvoids gripper mechanism 118 includes layeredge detecting sensors 139, each sensor used by thecontroller 132 to detect anedge 141 a and 141 b of thelayer 14, which can be used by the controller to center the gripper mechanism above the layer. In some embodiments, theedge detecting sensors 139 may be used for each layer, only some layers or even only the top layer. Theexpanders 130 a-130 d are initially in their lowered positions and thegripper mechanism 118 is lowered onto thelayer 14. As thegripper mechanism 118 is lowered,expanders contact product cases 16, which forces theexpanders magnetic sensors 138 are used to detect this movement, which indicates that expanders 30 a and 30 d are not aligned withvoids sensors 138 associated with theexpanders respective voids controller 132 then controls the pneumatics to raise theexpanders Expanders voids gripper mechanism 118 is lowered into its gripping position. - For
layer 14 ofFIG. 3 havingvoids controller 132, upon receipt of the indication from thedetectors 138, retractsexpanders expanders voids expanders 130 may be lowered relative to theframe 120 before, while or after thegripper mechanism 118 is lowered onto therespective layer 14 for the gripping operation. - Once the
appropriate expanders 130 are in thevoids linkages 142 shown most clearly byFIGS. 8A and 8B . Thelinkages 142cause pivot arms 144 to pivot outwardly as theactuator 140 extends to its position illustrated byFIG. 8B by riding alongangled surfaces 143 of the linkages. In some embodiments, theexpander 130 locks in its expanded position during layer gripping. Locking theexpander 130 in its expanded position inhibits the collapse of the expander during a gripping operation, even if pneumatic pressure is lost, which can decrease the probability of a failed gripping operation. Specifically, when thegrippers pallet layer 14, theproduct cases 16 responsively move and apply pressure against theexpander pivot arms 144. This in turn causes thepivot linkages 142 to press against the lowered portion of theactuator 140, thereby holding the actuator against upward movement until theside grippers layer 14. In some embodiments, springs (not shown) are used to spring bias thepivot arms 144 toward their collapsed configurations. - In some implementations, the locations, sizes and/or shapes of the voids may change, for example, depending on product and/or product case characteristics, such as size/shape of the product container, number of products per product case, etc. Thus, it may be desirable to provide the
gripper mechanism 118 with interchangeable expanders and/or provide the gripper mechanism with the capability to change the positions of the expanders relative to theframe 120. Referring toFIG. 8B , for example, theexpander 130 includes aquick disconnect pin 145 that can be used to disconnect theexpander 130 from the lower end of the pneumatic cylinder rod, which remains with thegripper mechanism 118. Removal of the pin and disconnecting of the air lines that operate thecylinder 140 allows theexpander 130 to be readily removed.Expander 147 ofFIG. 9 may then be connected to the gripper mechanism that includes an offset design where theexpander 147 has an actuation axis E that is offset from an actuation axis A. The offset actuation axis configuration is used to account for differences in void location as between pallet layers for different products. Various other expander configurations are possible. For example, referring toFIG. 10 , arectangular expander 149 is shown within arectangular void 151. - In some implementations, the
gripper mechanism 118 may also be used to move thepallet 15 onto the pallet recycle path 57 (FIG. 5 ) after all thelayers 14 are removed there from. Thecontroller 132, in this instance, may not lower any of theexpanders 130 as thedetectors 138 may not detect any voids. Similar to moving thelayers 14, thegripper mechanism 118 may grip thepallet 15 using gripper pairs 122, 124 and 126, 128 to apply a gripping force to the pallet. - The Film Removal Station
- The film removal station 58 (
FIG. 5 ) is used to remove the plastic film 32 (FIG. 4 ) from theindividual product cases 16 in an in-line process. Referring toFIG. 11 , a film cutting process for use in removing theplastic film 32 is illustrated diagrammatically. Thefilm removal station 58 includes afirst knife pair 146 and asecond knife pair 148. Thefirst knife pair 146 is illustrated as being initially outside of and oriented substantially perpendicular to theconveyor path 150, while thesecond knife pair 148 is located at opposite edges of and oriented substantially parallel toconveyor path 150, downstream of the first knife pair. As theproduct case 16 is held stationary at location A, thefirst knife pair 146 is moved across the conveyor path and cuts theplastic film 32 along oppositebottom edges FIG. 13 ). Referring toFIG. 12 , with theproduct case 16 moving to location B, thesecond knife pair 148 utilizes the movement of the product case to cut theplastic film 32 along oppositebottom edges 152, 154 (seeFIG. 13 ). In some embodiments, element 159 is a conveyor segment that allows thefirst knife pair 146 to pass thereby. As an alternative, element 159 may be one or more spaced rollers that are arranged and configured to allow thefirst knife pair 146 to pass thereby. - Referring now to
FIG. 13 , the knife pairs 146, 148 cut the bottom of the plastic film entirely across the length and width of the bottom. Thefirst knife pair 146 cuts at a bottom leading edge (e.g., at most about 1 inch or less from the leading edge, such as about ½ inch) and at bottom trailing edge (e.g., at most about 1 inch or less from the trailing edge, such as about ½ inch) of theproduct case 16, while thesecond knife pair 148 cut at bottom machine direction edges (e.g., at most about 1 inch or less from the trailing edge, such as about ½ inch) of the product case. These full cross-cuts allow for easier removal of theplastic film 32, as will be described below. -
FIGS. 14 and 15 show aheated knife assembly 161 of thesecond knife pair 148 in greater detail. Referring first toFIG. 14 , theheated knife assembly 161 includes amount 160 andparallel arms heated knife 164 is mounted to thearms 162. Theheated knife 164 is pivotally mounted to thearms arrows product case 16. - The
heated knife 164 is biased upwardly by biasingmechanism 170 that is connected to thearms 162.Biasing mechanism 170 includes anair cylinder 172 that acts as an adjustable spring supplying a vertical biasing force that can be used to hold theheated knife 164 against the bottom of the product case 16 (seeFIG. 15 ). Thefirst knife pair 146 can include similar pivoting and biasing structure. - Referring to
FIGS. 16-18 , theheated knife 164 has a double truncated pyramid shape with twopeaks valley 178. As can be seen best byFIG. 18 , the cutting edge (see element 176) of theheated knife 164 is thin and sharpened to a point to provide for film burn off, which can improve cutting during use.Peaks cartridge heater 190 is used to heat theknife 164. Aninsulating base 180 supports theheated knife 164. A pair of wave springs 182 and 186 located on opposite sides of pivot joint 188 provide opposing biasing forces that are used to bias the heated knife in the illustrated horizontal position. Thecutting edge 175 of theknife 164 is heated to a temperature such that during the cutting operation, theplastic film 32 melts away from the knife, which along with the sharpenededge 175 can improve film burn off and inhibit accumulation of plastic on the cutting edge. In some embodiments, theknife 164 is heated to a temperature between about 800 and 900 degrees F. - The two peak construction of the
knife cutting edge 175, in combination with the pivoting action, enables a single pass of a knife against the bottom of a case to perform two cuts along the same line, but separated slightly in time. These two cuts separated in time can be advantageous for cutting thicker or multilayer plastic film. - Referring to
FIG. 19 , a bottomfilm removal station 190 is used to remove a portion 192 (FIG. 14 ) of theplastic film 32 from theproduct case 16 after it has been cut. Bottomfilm removal station 190 includes abottom vacuum conveyor 193 that moves in the direction ofarrow 194 and a counter rotating niproller 196. A filmvacuum removal nozzle 198 is located below the counter rotating niproller 196. Referring toFIG. 20 , thefilm portion 192 is pulled between the counter rotating nip roller and thebottom vacuum conveyor 192 as theproduct case 16 moves thereover. The removedfilm portion 192 is then drawn into the filmvacuum removal nozzle 198 using negative pressure. A second filmvacuum removal nozzle 200 is then used to draw a remainingportion 202 of theplastic film 32 from theproduct case 16, thereby removing the plastic film. As noted above, thefull cross-cuts portions plastic film 32. - Referring to
FIG. 21 , in some embodiments, afilm lifting device 203 is used to lift the remainingportion 202 of theplastic film 32 from theproduct case 16 prior to reaching thevacuum removal nozzle 200. In the illustrated embodiment,counter-rotating mechanisms 204 are placed on opposite sides of the case conveying path and include includes rotating fingers 205 (e.g., having rubber ends 207) that come into contact with the remainingportion 202 of theplastic film 32 and apply a lifting force to the plastic film at the machine direction sides of the product case. The lifting force loosens the remainingportion 202 of theplastic film 32, which is then removed using thevacuum nozzle 200. - Product Metering System
- Once the
plastic film 32 is removed, theproduct cases 16 are directed to theproduct removal station 60 where therobots 62lift products 12 from their trays 64 and place the product on the product conveyor 66 (FIG. 5 ). Theindividual products 12 are delivered to themetering system 74.FIGS. 22 and 23 illustrate themetering system 74 associated with one of theproduct lines metering system 74 is used to control the amount of a certain product flavor and/or color delivered to the repackingstations -
Pins 208 are used as removable barriers to control feeding ofproducts 12 from certain product columns, which columns are separated by rails which are not shown. Thepins 208 are connected torails rails end product columns middle product column 244 do not have any associatedpins 208 so that products travel through these columns unimpeded. -
FIG. 24 shows a diagrammatic,simplified metering system 74 to illustrate its operation in metering products. The illustratedmetering system 74 includes afirst product path 220 and asecond product path 222. Products Y of a first flavor and/or color (e.g., yellow) travel alongpath 220 and products B of a second flavor and/or color (e.g., blue) travel alongpath 222. In this example, it is desired to feed three product Y for every one product B. Pins 208B are connected to rail B (represented by dotted lines) and pins 208F are connected to rail F (represented by dotted lines). Whenmotor 214 rotates in a counter-clockwise direction, pins 208F are positioned out of the associated product path to allow products to pass thereby and pins 208B are positioned in the associated product path to prevent products from passing thereby. In these illustrated pin positions, thefirst product path 220 is in a feed cycle where three product Y is fed from themetering system 74 while thesecond product path 222 is in a reload cycle where no product B is fed from the metering system. During the reload cycle, the products B are advanced alongsecond product path 222 up to thepin 208B. - As shown by
FIG. 25 , whenmotor 214 rotates in a clockwise direction, pins 208B are positioned out of the associated product path to allow products to pass thereby and pins 208F are positioned in the associated product path to prevent products from passing thereby. In these illustrated pin positions, thesecond product path 222 is in a feed cycle where one product B is fed from the metering system while thefirst product path 220 is in a reload cycle where no product Y is fed from the metering system. During the reload cycle, the products Y are advanced along thefirst product path 220 up to thepin 208F. As can be appreciated, the upstream pins are located a distance from the downstream pins to allow the desired amount of product (e.g., 1 blue and 3 yellow) to fit therebetween. For example,linkages 225 shown most clearly byFIG. 23 allow for placement of thepins 208 at spaced-apart distances. In some embodiments, thepins 208 are moveable along the length of the linkages to change the distances between the upstream pins and the downstream pins and thus the amount of product that can fit therebetween. - Referring now to
FIG. 26 , the above-described metering process is repeated andproducts 12 are fed from themetering system 74 to a mergingstation 232 where products from some adjacent rows leaving the metering system are merged together to create rows of products having different flavors and/or colors. In the illustrated embodiment, themetering system 74 includes nineproduct columns column products 12 of a particular color and/or flavor associated therewith represented by R (e.g., red), Y (e.g., yellow) and B (e.g., blue).End columns middle column 244 feed directly intorespective paths station 232 without any merging ofproducts 12. By contrast,columns path 260 to provide a column of both R and Y products as the products are metered usingpins metering system 74 andcolumns path 262 to provide a column of both Y and B products as the products are metered usingpins metering system 74 meters the products so that, once merged inpaths path 260 and three Y products and one B product alongpath 262. - Each
path stations 86 and 88 (FIG. 5 ) where the products are accumulated. Once products are accumulated, they are transferred back into trays 64.FIG. 27 illustrates repacked trays of an assortment ofproducts 12 including a predetermined number of B, Y andR products 12. In this example, eachrow path - It is to be clearly understood that the above description is intended by way of illustration and example only and is not intended to be taken by way of limitation, and that changes and modifications are possible. Accordingly, other embodiments are within the scope of the following claims.
Claims (23)
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US11/738,237 US7934759B2 (en) | 2007-04-20 | 2007-04-20 | Packaging system including pallet de-layering system |
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US11/738,237 US7934759B2 (en) | 2007-04-20 | 2007-04-20 | Packaging system including pallet de-layering system |
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Cited By (2)
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US20100183419A1 (en) * | 2009-01-21 | 2010-07-22 | Marvin L Stringfield | Stabilized Device For Moving A Plurality Of Containers |
DE102011008531A1 (en) * | 2011-01-13 | 2012-07-19 | Krones Aktiengesellschaft | Apparatus and method for applying a stiction-increasing agent to a surface portion of a stack layer |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CA2892342C (en) | 2014-05-22 | 2016-11-01 | Sylvain-Paul Morency | Tool and method for layer depalletizing |
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US20100183419A1 (en) * | 2009-01-21 | 2010-07-22 | Marvin L Stringfield | Stabilized Device For Moving A Plurality Of Containers |
US8622686B2 (en) * | 2009-01-21 | 2014-01-07 | Arrowhead Systems, Inc. | Stabilized device for moving a plurality of containers |
DE102011008531A1 (en) * | 2011-01-13 | 2012-07-19 | Krones Aktiengesellschaft | Apparatus and method for applying a stiction-increasing agent to a surface portion of a stack layer |
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